<template>
    <el-menu
            :default-active="activeMenu"
            mode="horizontal"
            @select="handleSelect"
    >
        <template v-for="(item, index) in topMenus">
            <el-menu-item :style="{'--theme': theme}" :index="item.path" :key="index" v-if="index < visibleNumber"
            >
                <svg-icon :icon-class="item.meta.icon"/>
                {{ item.meta.title }}
            </el-menu-item
            >
        </template>

        <!-- 顶部菜单超出数量折叠 -->
        <el-sub-menu :style="{'--theme': theme}" index="more" v-if="topMenus.length > visibleNumber">
            <template #title>更多菜单</template>
            <template v-for="(item, index) in topMenus">
                <el-menu-item
                        :index="item.path"
                        :key="index"
                        v-if="index >= visibleNumber"
                >
                    <svg-icon :icon-class="item.meta.icon"/>
                    {{ item.meta.title }}
                </el-menu-item
                >
            </template>
        </el-sub-menu>
    </el-menu>
</template>

<script setup>
import {constantRoutes} from '@/router';
import {isHttp} from '@/utils/validate';

// 顶部栏初始数
const visibleNumber = ref(null);
// 当前激活菜单的 index
const currentIndex = ref(null);
// 隐藏侧边栏路由
const hideList = ['/index', '/user/profile'];

const store = useStore();
const route = useRoute();
const router = useRouter();

// 主题颜色
const theme = computed(() => store.state.settings.theme);
// 所有的路由信息
const routers = computed(() => store.state.permission.topbarRouters);

// 顶部显示菜单
const topMenus = computed(() => {
    const topMenus = [];
    routers.value.map((menu) => {
        if (menu.hidden !== true) {
            // 兼容顶部栏一级菜单内部跳转
            if (menu.path === '/') {
                topMenus.push(menu.children[0]);
            } else {
                topMenus.push(menu);
            }
        }
    });
    return topMenus;
});

// 设置子路由
const childrenMenus = computed(() => {
    const childrenMenus = [];
    routers.value.map((router) => {
        for (const item in router.children) {
            if (router.children[item].parentPath === undefined) {
                if (router.path === '/') {
                    router.children[item].path = `/${router.children[item].path}`;
                } else if (!isHttp(router.children[item].path)) {
                    router.children[item].path = `${router.path}/${router.children[item].path}`;
                }
                router.children[item].parentPath = router.path;
            }
            childrenMenus.push(router.children[item]);
        }
    });
    return constantRoutes.concat(childrenMenus);
});

// 默认激活的菜单
const activeMenu = computed(() => {
    const {path} = route;
    let activePath = path;
    if (path !== undefined && path.lastIndexOf('/') > 0 && hideList.indexOf(path) === -1) {
        const tmpPath = path.substring(1, path.length);
        activePath = `/${tmpPath.substring(0, tmpPath.indexOf('/'))}`;
        store.dispatch('app/toggleSideBarHide', false);
    } else if (!route.children) {
        activePath = path;
        store.dispatch('app/toggleSideBarHide', true);
    }
    activeRoutes(activePath);
    return activePath;
});

function setVisibleNumber() {
    const width = document.body.getBoundingClientRect().width / 3;
    visibleNumber.value = parseInt(width / 85);
}

function handleSelect(key, keyPath) {
    currentIndex.value = key;
    const route = routers.value.find((item) => item.path === key);
    if (isHttp(key)) {
        // http(s):// 路径新窗口打开
        window.open(key, '_blank');
    } else if (!route || !route.children) {
        // 没有子路由路径内部打开
        router.push({path: key});
        store.dispatch('app/toggleSideBarHide', true);
    } else {
        // 显示左侧联动菜单
        activeRoutes(key);
        store.dispatch('app/toggleSideBarHide', false);
    }
}

function activeRoutes(key) {
    const routes = [];
    if (childrenMenus.value && childrenMenus.value.length > 0) {
        childrenMenus.value.map((item) => {
            if (key == item.parentPath || (key == 'index' && item.path == '')) {
                routes.push(item);
            }
        });
    }
    if (routes.length > 0) {
        store.commit('SET_SIDEBAR_ROUTERS', routes);
    }
    return routes;
}

onMounted(() => {
    window.addEventListener('resize', setVisibleNumber);
});
onBeforeUnmount(() => {
    window.removeEventListener('resize', setVisibleNumber);
});

onMounted(() => {
    setVisibleNumber();
});
</script>

<style lang="scss">
.topmenu-container.el-menu--horizontal > .el-menu-item {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active, .el-menu--horizontal > .el-sub-menu.is-active .el-submenu__title {
  border-bottom: 2px solid #{'var(--theme)'} !important;
  color: #303133;
}

/* sub-menu item */
.topmenu-container.el-menu--horizontal > .el-sub-menu .el-sub-menu__title {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}
</style>
